page_title: Pollution
section_title: Air pollution
hierarchical_section_title: Pollution / Air pollution
context_page_description: Pollution is when harmful substances are added to the environment and then change it in a bad way. There are five kinds of pollution of the environment: water pollution, air pollution, noise pollution, soil pollution and thermal pollution.
  As pollution grows, ways to combat it have grown. Solar energy and wind energy give people clean ways to power their homes. When people use these alternative forms of energy, they put less carbon dioxide into the environment.
context_section_description: Air can be polluted by many things.  Examples include poisonous gases, sulphur dioxide, nitrogen dioxide, carbon monoxide and very small particulates.  Smoke and harmful gases released by fires, industries, and thermal power plants cause air pollution.  Using coal and wood as fuels for fire causes a lot of air pollution.  Petroleum produces less pollution per ton, but it causes a lot of pollution since a lot of it is burned globally.  Air pollution may cause health problems such as asthma or other breathing problems. 
  Air pollution causes global warming and acid rain. This makes it difficult for some living things to survive.
caption: Smoke coming out from a chimney is an example of air pollution.
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